Quantum Creep in Y_{1-x}Pr_{x}Ba₂Cu₃O₇ Crystals: Magnetic Relaxation and Transport

T. Stein , G. A. Levin , C. C. Almasan (1) , D. A. Gajewski , M. B. Maple (2) ((1) Kent State University (2) University of California , San Diego)

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classification ❄️ cond-mat.supr-con

keywords creepfluxmagneticquantumrelaxationtransitiontransportcoupling

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We report transport and magnetic relaxation measurements in the mixed state of strongly underdoped Y_{1-x}Pr_{x}Ba_{2}Cu_{3}O_{7} crystals. A transition from thermally activated flux creep to temperature independent quantum flux creep is observed in both transport and magnetic relaxation at temperatures T * 5 K. Flux transformer measurements indicate that the crossover to quantum creep is preceded by a coupling transition. Based on these observations we argue that below the coupling transition the current is confined within a very narrow layer beneath the current contacts.

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Quantum Creep in Y_{1-x}Pr_{x}Ba₂Cu₃O₇ Crystals: Magnetic Relaxation and Transport

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